"Katie's planning a total makeover on her return from her holiday in Marbella next week," a source told the magazine.

"She's desperate to make herself into the perfect woman for Leandro, who has told her he prefers a more natural look."

They added: "Katie is going to go down a cup size to a D and says she wants pert boobs so she can do another Playboy shoot.

"Katie knows that she's never going to find Mr Perfect - he doesn't exist - but she's hell-bent on not letting Leo walk away, and hopes that making herself look the part will encourage him to pop the question."